I've been going to AMS almost every year since my family moved there (well to the southern suburbs). The decline started in early 2000s and came into culmination this year.

The telling sign was the closing of Thermos Nacht (never reopened) and Sex of Sunday. (actually Sex on Sunday reopened this year, at its usual Kerkstraat location). To be fair, most places reopened this year, with new names.

It not the same crowd though. The town changed, the crowd (far from being dutch) are mostly tourists.

There are some gay things to do, but its not what it used to be. It's still a crazy place on Queen's day / pride when people come into town.